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Note: the "according to the Arab and Jewish custom"(sic) statement in the original article is itself a misprint! -- because: being "quickly and unceremoniously dumped in these mass graves", (without the usual rituals or preparation (i.e., washing and shrouding of the corpse, and prayers), was NOT according to Arab [or Jewish(sic)] custom. But that's a side-issue.
The key-phrase which I now see that your lack of knowledge of the history of the Zionist conquest of Palestine could have caused you to misinterpret, and hence, draw erroneous conclusions, is this:
"during the final months of fighting in 1948"
Because as far as the fighting in/for JAFFA is concerned, (which is where the mass-graves in question are located),
--> "the final months of fighting in 1948" were in fact the months of April, and the beginning of May, 1948! <--
(The Jewish attacks on Jaffa having begun already in January of 1948, or even earlier!) The fighting in Jaffa was all over, well before any of the combined Arab Nations entered into the ongoing war, which the Jewish forces had started half a year earlier, and were continuing to pursue against the native Palestinian Arab population.
"There you have it... WAR DEAD... Not Murder...Not War Crimes... Nobody was pushed into the sea.."
"War dead", if you call the very one-sided war of the Zionists against the civilian population of Jaffa a proper war; many call that sort of "warfare" murder and massacre. Certainly not casualties due to any "invasion" by neighboring Arab countries. These bones are apparently of those who failed to succeed in fleeing in time. (Even though a very small number of Arabs both managed to survive there, AND to avoid being expelled.)
But NO proof whatsoever that the Jews didn't in fact "push he Arabs of Jaffa (and Haifa and Acre) into the sea"! (As is documented elsewhere.)